Refactor back edge table related code into a new class.

src/deoptimizer.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 113 matching lines @@
  public:
   enum BailoutType {
     EAGER,
     LAZY,
     SOFT,
     // This last bailout type is not really a bailout, but used by the
     // debugger to deoptimize stack frames to allow inspection.
     DEBUGGER
   };
 
-  enum InterruptPatchState {
-    NOT_PATCHED,
-    PATCHED_FOR_OSR
-  };
-
   static const int kBailoutTypesWithCodeEntry = SOFT + 1;
 
   struct JumpTableEntry {
     inline JumpTableEntry(Address entry,
                           Deoptimizer::BailoutType type,
                           bool frame)
         : label(),
           address(entry),
           bailout_type(type),
           needs_frame(frame) { }
@@ skipping 57 matching lines @@
   // refer to that code.
   static void DeoptimizeMarkedCode(Isolate* isolate);
 
   // Visit all the known optimized functions in a given isolate.
   static void VisitAllOptimizedFunctions(
       Isolate* isolate, OptimizedFunctionVisitor* visitor);
 
   // The size in bytes of the code required at a lazy deopt patch site.
   static int patch_size();
 
-  // Patch all interrupts with allowed loop depth in the unoptimized code to
-  // unconditionally call replacement_code.
-  static void PatchInterruptCode(Isolate* isolate,
-                                 Code* unoptimized_code);
-
-  // Patch the interrupt at the instruction before pc_after in
-  // the unoptimized code to unconditionally call replacement_code.
-  static void PatchInterruptCodeAt(Code* unoptimized_code,
-                                   Address pc_after,
-                                   Code* replacement_code);
-
-  // Change all patched interrupts patched in the unoptimized code
-  // back to normal interrupts.
-  static void RevertInterruptCode(Isolate* isolate,
-                                  Code* unoptimized_code);
-
-  // Change patched interrupt in the unoptimized code
-  // back to a normal interrupt.
-  static void RevertInterruptCodeAt(Code* unoptimized_code,
-                                    Address pc_after,
-                                    Code* interrupt_code);
-
-#ifdef DEBUG
-  static InterruptPatchState GetInterruptPatchState(Isolate* isolate,
-                                                    Code* unoptimized_code,
-                                                    Address pc_after);
-
-  // Verify that all back edges of a certain loop depth are patched.
-  static bool VerifyInterruptCode(Isolate* isolate,
-                                  Code* unoptimized_code,
-                                  int loop_nesting_level);
-#endif  // DEBUG
-
   ~Deoptimizer();
 
   void MaterializeHeapObjects(JavaScriptFrameIterator* it);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   void MaterializeHeapNumbersForDebuggerInspectableFrame(
       Address parameters_top,
       uint32_t parameters_size,
       Address expressions_top,
       uint32_t expressions_size,
       DeoptimizedFrameInfo* info);
@@ skipping 694 matching lines @@
   Object** expression_stack_;
   int source_position_;
 
   friend class Deoptimizer;
 };
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEOPTIMIZER_H_